Synthesis loop waste heat recovery

The earlier plants operated at deficit, and needed an auxiliary boiler, which was integrated in the flue gas duct. Auxiliary burners in tunnels or flue gas duet were additionally used in some instances. This situation was partially caused by inadequate waste heat recovery and low efficiency in some energy consumers. Typically, the furnace flue gas was discharged in the stack at rather high temperature because there was no air preheating and too much of the reaction heat in the synthesis loop was rejected to the cooling media (water or air). In addition, efficiency of the mechanical drivers was low and the heat demand for regenerating the solvent from the C02 removal unit (at... 

Waste Heat Recovery in Ammonia Synthesis Loops.251... 

The quality of the recovery heat is related to the temperature or pressure of the steam. In ammonia synthesis loop, the reaction heat is forepart applied to heat the feed water of waste heat boiler. With the use of turbocompressor, the reaction heat is commonly used to get high pressure steam as power to drive it, and use in rundle as shown in Fig. 9.26. 

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